*

Fe-C-Si-Al

CC

CCC

-

Si

Ms

127

Time

TTAtA

128

C Si Mn S P Cu3.2 2.2 0.37 0.04 0.04 0.12

CO2

:)Campbell-1998(.

ASTM A370

ASTM A370

G(mm)R(mm)D(mm)A(mm)645

CCC

ZWICK

(1/sec)

129

0100200300400500600

275 325 375

0

100

200

300

400

500

600

275 325 375

0

100

200

300

400

500

600

275 325 375

0100

200300400

500600

275 325 375

Fe-C-Al

C

C

.

CC

.

050

100150200250300350400450500

0 1 2 3 4

w t% Al

130

0

100

200

300

400

500

600

0 1 2 3 4w t% Al

0

100

200

300

400

500

600

0 1 2 3 4

w t% Al

0

100

200

300

400

500

600

0 1 2 3 4w t% Al

0

100

200

300

400

500

600

0 1 2 3 4w t% Al

D

A

D

050

100150200250300350400450500

0 1 2 3 4

w t% Al

131

Fe-C-AlFe-C-Si

132

0

100

200

300

400

500

600

275 325 375

t=1 min.t=30 mint=60 min.t=120 min.

0

100

200

300

400

500

600

275 325 375

s

t=1 min.t=30 min.t=60 min.t=120 min.

0

100

200

300

400

500

600

275 325 375

a

t=1 min.t=30 min.t=60 min.t=120 min.

0

100

200

300

400

500

600

275 325 375

t=1min.t=30 min.t=60 min.t=120 min.

00.10.20.30.40.50.60.70.80.9

1

275 325 375

t=1 min.

t=30 min.

t=60 min.

t=120 min.

00.10.20.30.40.50.60.70.80.9

1

275 325 375

t=1 min.

t=30 min.

t=60 min.

t=120 min.

00.10.20.30.40.50.60.70.80.9

1

275 325 375

t=1 min.

t=30 min.

t=60 min.

t=120 min.

00.10.20.30.40.50.60.70.80.9

1

275 325 375

t=1 min.

t=30 min.

t=60 min.

t=120 min.

133

050

100150200250300350400450500

275 325 375Austempering temprature

Al=0 wt%Al=1 wt%Al=2 wt%Al=4 wt%

0

100

200

300

400

500

600

0 30 60 90 120

Austem per ing tim e(m in)

0

100

200

300

400

500

600

0 30 60 90 120

Aus tem per ing tim e(m in)

0

100

200

300

400

500

600

0 30 60 90 120

Aus tem per ing tim e(m in)

0

100

200

300

400

500

600

0 30 60 90 120

Aus tem per ing tim e(m in)

134

050

100150200250300350400450500

0 30 60 90 120

Aus tem per ing t im e(m in)

Al=0 w t%Al=1 w t%Al=2 w t%Al=4 w t%

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Austempered Spheroidal Graphite Aluminum Cast Iron." Wear, Vol. 165, PP. 19-24.

2 - Hayrynen, K. L., Loftus, S. M., May, R. L., Moore, D. J. and Rundman, K. B. (1995). "Microstructural Study

of Ausformed-Austempered Ductile Iron." AFS Transaction, PP. 157-161.

135

3 - Nili Ahmadabadi, M., Abbasi Khazai, B. and Bahmani, M. (1997). "Effect of Austempering Variables on the

Mechanical Properties of Ni-Mn-Cu ADI." AFS Transaction, PP. 501-505.

4 - Boutorabi, S. M. A., Young, J. M. and Kondic, V. Austempered Kinetics of Spheroidal Graphite Aluminum

Cast Iron. Unpublished Work

5 - Krishnaraj, D. and Seshan, S. (1995). "Influence of austempered variables on the structure and properties of

unalloyed ADI." AFS Transaction, PP. 767-775.

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AFS Transaction, PP.757-761.

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Iron." Solidification Technology in the Foundry and Cast House, Metals Society, PP. 562-568.

8 - Martinez, F. and Stefanescu, D. M. (1983). "Properties of compacted/vermicular graphite cast irons in the Fe-

C-Al system by ladle and in-mold treatment." AFS Transaction, 1983, PP. 593-606.

9 - Boutorabi, S. M. A. and Young, J. M. and Kondic, V. (1992). "Ductile aluminum cast iron." Cast Metals,

Vol. 5, No. 3, 1992, PP. 122-129.

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No. 10-11, PP.81-88.

11 - Boutorabi, S. M. A. and Din, T. (1997). "Microstructure and Mechanical Properties of as Cast and

Austempered Si and Al Containing grey Cast Irons." International Journal of Engineering Iran University of

Science & Technology, Vol. 8, No. 1a, PP. 23-33.

12 - Dorazil, E. (1986). "Mechanical properties of austempered ductile iron." Foundry M&T, PP.36-45.

13 - Dawson, J. V. (1972). "High strength grey cast irons containing 2 percent aluminum." BCIRA Report, No.

1058, PP.26-31.

1 - Processing Window 2 - Acicular3 - Round Ended Graphite 4 - Processing Window

136